Oleg Alexandrov

lambda

← Назад

message = lambda: print("hello")

message()   # hello

Аналог:

def message(): print("hello")

message()   # hello

sum = lambda a, b: a + b

print(sum(4, 5))    # 9
print(sum(5, 6))    # 11

Передача лямбда-выражения в качестве параметра:

def do_operation(a, b, operation):
    result = operation(a, b)
    print(f"result = {result}")

do_operation(5, 4, lambda a, b: a + b)  # result = 9
do_operation(5, 4, lambda a, b: a * b)  # result = 20

Возвращение лямбда-выражений из функций:

def select_operation(choice):
    if choice == 1:
        return lambda a, b: a + b
    elif choice == 2:
        return lambda a, b: a - b
    else:
        return lambda a, b: a * b

operation = select_operation(1)  # operation = sum
print(operation(10, 6))          # 16

operation = select_operation(2)  # operation = subtract
print(operation(10, 6))          # 4

operation = select_operation(3)  # operation = multiply
print(operation(10, 6))          # 60

Замыкания

def multiply(n): return lambda m: n * m

fn = multiply(5)
print(fn(5))        # 25
print(fn(6))        # 30
print(fn(7))        # 35

← Назад

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